How can PHP source code stored in a MySQL database be executed properly?

When storing PHP source code in a MySQL database, the code is stored as a string and needs to be executed properly when retrieved. To execute PHP source code stored in a MySQL database, you can retrieve the code as a string from the database, use `eval()` function in PHP to execute the code, and ensure proper error handling to catch any issues that may arise during execution.

// Retrieve PHP source code from MySQL database
$code = "SELECT php_code FROM code_table WHERE id = 1";
// Execute the retrieved PHP code
eval($code);